I had a small flock of 2 hens and 2 roosters. I rehomed a rooster and got two new hens around the same age as my other 3; 5 months. I've never had issues with them going into the coop at night until the day I introduced the new 2. Only one hen went in for the night. The next night I put a night light on in the coop and eventually all 4 hens went in but my rooster still wouldn't. Is this normal with introducing new members? Once they are all used to each other will they all start going back into the coop at night?